Watch movement controlling directly a central seconds gear



Dec. 8, 1959 L BAMAT 2,915,873

' WATCH MOVEMENT CONTROLLING DIRECTLY A CENTRAL SECONDS GEAR Filed April27, 1956 2 Sheets-Sheet l Dec. 8, 1959 J. BAMAT v WATCH MOVEMENTcoNTRoLLTNG DIRECTLY A CENTRAL SECONDS GEAR Flled April 27, 1956 2Sheets-Sheet 2 mi y/l//////////////////////////////L ss im l I A UnitedStat@ Patent O WATCH MOVEMENT CONTROLLING DIRECTLY A CENTRAL SECONDSGEAR Joseph Bamat, Granges, Switzerland, assignor to Amida S.A.,Granges, Switzerland, a Swiss firm My invention has for its object awatch movement controlling directly a central seconds gear, said centralseconds gear being controlled from the barrel by a first intermediategear, a second intermediate wheel and a third gear.

According to my invention, this movement includes a gearing with twogears connecting the winding up pinion with the ratchet wheel on thebarrel which revolves against normal while the latter controls thecannon wheel through the agency of a friction coupling with two coaxialwheels in a manner such that the transient rotation of the cannon wheelproduced by the motion-work during the time-setting operation has noaction on the barrel. i

I have illustrated in accompanying drawings by way of example twopreferred embodiments of the object of my invention. In said drawings:

Figs. l to 4 relate to the first embodiment and, more specifically, Fig.l is a simplified-view of the movement as seen from the dial side.

Fig. 2 is a cross-section on a larger scale through line II--II of Fig.1.

Fig. 3 is a diagrammatic plan view of the movement as seen from thebridge side.

Fig. 4 is a cross-section on a larger scale through line lV-IV of Fig.3.

Fig. 5 is a diagrammatic plan view of the second embodiment, themovement being considered from the dial side.

Fig. 6 is a cross-section on a larger scale through line VI-VI of Fig.5.

In the example illustrated for the first embodiment, the watch movementcomprises a central seconds gear including a toothed wheel 1 Controlleddirectly by the barrel teeth 2 through the agency of a firstintermediate gear 30, 31, a second intermediate gear 32, 33 and a thirdgear. The toothed wheel 3 of the latter meshes with the toothed wheel 1on the center seconds gear. These two last wheels 1 and 3 and the centerwheel are located in the same plane extending medially between thenishing plate 5 and the surface 4 of the barrel drum facing the latter.By reason of the even number of gears (two intermediate wheels, thirdwheel and seconds gear) required for driving the seconds hand in thedesired direction, the barrel should revolve against normal. For thisreason, the pinion p on the winding up means drives the ratchet wheel 6on the barrel 2-4 through the agency of two transmission wheels 7 and 8instead of only one.

The teeth 2 on the barrel drive the cannon wheel 10 through the agencyof a friction coupling including two concentric superposed wheels 11 and12. The wheel 11 which is comparatively thin is provided with openings13 which bestow it with a certain radial elasticity due to which it isheld frictionally over the hub of the wheel 12 (Figs. l and 2). Saidwheel 11 meshes with the teeth 2 on the barrel. On the other hand, thewheel 12 is fitted on a projection 14 rigidly secured at a shortdistance from the cannon wheel to the plate 15 and is 2,915,873 PatentedDec. 8, 19,59

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rigid with a motionwork pinion 16 meshing with a toothed wheel 17 formedon the hour wheel pipe H.

For time-setting, the sliding pinion 18 on the winding up stern iscaused to engage, under the action of conventional drawing out means 19,a transmission pinion 20 which meshes with the toothed wheel 12 of thefriction coupling. Through the action of the latter, the rotation of thecannon wheel 10 produced by the wheel 12 acting as part of the motionwork during the time setting has no action on the barrel. 34 designatesthe pin escape wheel, 35 the balance.

In the second embodiment, the friction coupling bctween the barrel teeth2 and the pinion on the cannon wheel 21 includes two coaxial toothedVpinions 22 and 23 between which is clamped a frusto-conical slit washer24. The pinion 21 meshes with a motion work wheel 25 forming with itspinion 26 la speed reducing gear for the hour pipe 27.

It should be remarked that the driven wheel 23 of the friction couplingand the motion work wheel 25 which both engage the cannon wheel 21 arelocated substantially at the s ame level as the latter and to eitherside thereof.

The winding up is performed in the same manner as in the precedingcase.V The time setting is produced through a single gear 29`controlledby the sliding pinion and meshing with the motion work wheel 25 asillustrated in Fig. 5. The particular structure and arrangement of theintermediate gears 30, 31, 32, 33 have kbeen illustrated for sake ofcompleteness but do not actually form part of the invention as definedin the accompanying claims.

What I claim is:

l. In a watch movement, the combination of a toothed barrel, a finishingplate lying in a plane extending at a short distance above the barrel, afirst intermediate gear including a pinion controlled by the barrel anda first wheel, a second intermediate gear controlled by the first wheel,a third wheel controlled by the second intermediate gear, a centralseconds wheel controlled by the third wheel, said three wheels beinglocated in a common plane extending between the plane of the finishingplate and the plane passing through the upper surface of the barrelfacing the last-mentioned plane, a friction coupling including twocoaxial wheels and a common axial carrier for the latter, one of saidcoaxial wheels meshing with the barrel, a cannon wheel meshing with thesecond coaxial wheel, an hour wheel and a motion work pinion operativelyconnecting the cannon wheel with the hour wheel.

2. In a watch movement, the combination of a toothed barrel, a finishingplate lying in a plane extending at a short distance above the barrel, afirst intermediate gear including a pinion controlled by the barrel anda first wheel, a second intermediate gear controlled by the first wheel,a third wheel controlled by the second intermediate gear, a centralseconds Wheel controlled by the third wheel, said three wheels beinglocated in a common plane extending between the plane of the finishingplate and the plane passing through the upper surface of the barrelfacing the last-mentioned plane, a friction coupling including twocoaxial wheels and a common axial carrier for the latter, one of saidcoaxial wheels meshing with the barrel, a cannon Wheel meshing with thesecond coaxial wheel, an hour wheel, a motion work pinion operativelyconnecting the cannon Wheel with the hour wheel, winding up means forthe barrel, a ratchet wheel coaxially rigid with the barrel, a gearingincluding. two pinions operatively connecting the winding up means withthe ratchet wheel, and time-setting means controlled by the winding upmeans for the time-setting and adapted to act on the motion work.

3. In a watch movement, the combination of a toothed barrel, a finishingplate lying in a plane extending at a short distance above the barrel, afirst intermediate gear including a pinion controlled by the barrel anda first wheel, a second intermediate gear controlled by the first wheel,a third wheel controlled by the second intermediate gear, a centralseconds wheel controlled by the third wheel, said three wheels beinglocated in a common plane extending between the plane of the finishingplate and the plane passing through the upper surface of the barrelfacing the last-mentioned plane, a friction coupling including twocoaxial wheels and a common axial carrier for the latter, one of saidcoaxial wheels meshing with the barrel, a cannon wheel meshing with thesecond coaxial wheel,v an hour wheel, a motion work pinion coaxiallyrigid with the second coaxial wheel of the friction coupling and meshingwith the hour wheel and time-setting means engaging said second coaxialwheel.

4. In a watch movement, the combination of a toothed barrel, a finishingplate lying in a plane extending at a short distance above the barrel, afirst intermediate gear including a pinion controlled by the barrel anda first Wheel, a second intermediate gear controlled by the first wheel,a third Wheel controlled by the second intermediate gear, a centralseconds wheel controlled by the third wheel, said three wheels beinglocated in a common plane extending between the plane of the finishingplate and the plane passing through the upper surface of the barrelfacing the last-mentioned plane, a friction coupling including twocoaxial wheels and a common axial carrier for the latter, one of saidcoaxial wheels meshing with the barrel, a cannon wheel meshing with thesecond coaxial wheel, an hour wheel, a motion work pinion in- 4 cludingtwo coaxial wheels meshing respectively with the cannon wheel and withthe hour wheel, the pinion meshing with the cannon wheel lying in thesame plane as the second coaxial wheel meshing with said cannon wheeland time-setting means engaging the motion work.

5. In a watch movement, the combination of a toothed barrel, a finishingplate lying in a plane extending at a short distance above the barrel, afirst intermediate gear including a pinion controlled by the barrel anda first wheel, a second intermediate gear controlled by the first wheel,a third wheel controlled by the second intermediate gear, a centralseconds wheel controlled by the third wheel, said three wheels beinglocated in a common plane extending between the plane of the finishingplate and the plane passing through the upper surface of the barrelfacing the last-mentioned plane, a friction coupling including a commonaxial carrier and two coaxial wheels frictionally engaging each other,revolubly carried by said carrier and of which one is thin andperforated to show radial elasticity, the first coaxial wheel meshingwith the barrel, `a cannon wheel meshing with the second coaxial wheel,an hour wheel and a motion work operatively connecting the cannon wheelwith the hour wheel.

References Cited in the file of this patent UNITED STATES PATENTS819,568 Manthey May 1, 1906 2,618,118 Harris et al. Nov. 18, 19522,781,630 Bamat Feb. 19, 1957 FOREIGN PATENTS 125,517 Switzerland Apr.16, 1928

